brewster



P. D. BREWSTER. APPARATUS FOB COLUR CINEMATOGRAPHY. Mmc/mon min lum: 2s. Isla. neun/5o rcs. 3. |920.

Patented N ov.

P. D. BREWSTER.

APPARATUS FOR COLOR CINEMATOGRPHY. APPucAnon men :uns 29. |918. nenn/su rin. 3, |920.

Patented Nov. 16, 1920.

4 SHEETS-SIRET 2.

P. D. BREWSTER.

APPARATUS FOR COLUR CINEMATOGRAPHY. APPLICATION man UNE 29,1918. ncnzwzo rma, 1920.

1 ,359,025. Patented Nov. 16, 1920.

P. D. BREWSTER.

APPARATUS FOR COLOR CINEMATOGRAPHY. APPLlcmou FILED lun: 29. 191s. nENEwEo ris. 3. |920.

1 ,359,025. Patend Nov. 16, 1920.

` 4 4 sains-SHEET 4.

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voen-'11215, 'sT-Ares' PATENT 'O FFACBF j rEncY. DOUGLAS nnnws'rna, or Ens'r ORANGE, NEW unser.

-A l l ,Arran-Aros Foacomncmsmaroennrnr 1,35%);625. .i Specification of Letters -Patent Pal-ted Nov. 16, 19.20. i

Application mea ricerca,vv 191e, semi ne. 242,539; aenewea rem-nary e, 1920. serial no. assess,

To all whom it may concern: Be 'it known that' 1, BnEwsm,

- a citizen of the United` States,-res1dmg at Orange, in the county of Essex and 5 State of vNew Jersey, have inventedl certain new and useful Improvements m A aratus for Color Cinematograply, of whic the following is a full, clear,an :exact descrlption.;-

v In'theart f lrles'gof;nuages"or" ictures von one -of the films taken. j throug 4a red filtern and the 15 other series onthe other film taken throuth 'e a green filter, and. then by'contact print two, series on the opposite sides of a vpositive which iS sensitized on both sides.- fhe positive film is then" developed, 'and fixed 2o andthe images on the two sides are staine' or colored, say red on one side and 'green on Y vthe other, so that when the two images are n projectedj (of course sixnultaneously)` on the 'annitary image 1n .substantially natural colors will result. r- So far as -I' am aware this method, in which the color reci `ords are madefon' two separate films, has never been successful in' practice, liowever attractive in theory; the reason being the difficulty, heretofore insuperable, ofsecur- Aing accurate enough registry of the una esf in printin them on the positive film.

he necessity or accurate re lstry will be af --parentwhen it is reinem red that if pictures are out of registry on the positive 'lm the defect is evidenced on the screen by red and green color bandsv orfringes at the ed es of the objects plgtographed have' therefore n ed to devise my l40 presentinvention, which has for its chiefV object to .provide an improved method and apparatus whereb f adequate 'registry' can readily be attains To this and other ends the invention consists-in the novel procedure 5 'and apparatus `hereinafter described.

In carrying out the inventionin the preferred manner each negative picture is ositioned, at thetime of exposure, in a de nite ,and fixed relation toone or more perfora tions,1but preferably two,fin each negative film. This is effected by the use of registry pins, which enter the selected perforatiens, sayone on each side of the film, beforethe exposure is made, so as to locate each film in theexposure position. Usually the same 4tive images are then used to I offeolor it j has'A b'een proposed to make two color records,fon

separateregative films',for example Aone seperforations as Wereused to locate the negaister the negative ima with each other-jin printing the positive. I also prefer to use films perforated before exposure with the standardspacng, as I have ffo'und that the first highly accurate results, but it is within the spirit of my invention to Vuse'speicial perforations in each negative ilm.-

class perforating machines 'now in use gi'v'e 'i' Referrin to theaccompanying drawin I,

in' which t e referred .embodiment of t ve invention is il ustrated, Figure 1 is a sectional lan View ofthe camera (omitting the usual ight-tight casing and the film-feeding' mechanism) showingthe registry pins" in their advanced positions.

Fig. 2 is a side view of the parts shown in 1, partly in vertical sectlon.

. 2* 1s a cross section of the light- 'splitting device on a plane at right angles i to the optical axis of the lens, illustrating a method vof tilting the 'device to raise `or lower one of the images.

Fig. 3 is an elevational view of the reflectin and transmitting surface of the li htspitting device by which part of the llght from the lens' is transmitted to one of the negative films and part reflected to the other.

.Fig 4 is a rear view f one of the registr 'plates and its pair ofregistry pins.

1g. 5 is a' detail section, on a larger scale,

showin one of the registry pins about to enter t e selected perforation in the nega? tive film.

` Fig. 6'is a detail front view, on the same Fig. 7 is a diagrammatic lan view of the A l more important parts of t e printing ma-l chine that I prefer to use.

Fi 8 is an end View, partly in section on. line B of Fig. 7.I V

Figi. 8 is a plan view of the commugitor c controls the printing solenoids.

Fig.- 8B. is a" diagram representing `the timing of the solenoids.

Fig. 9 is a side view of the parts shown in Flg. 7

Figs. 10, 11 and 12.are` rear .views of regi i istry plates, showing different arrangements of the registry plates,

Figs. 13 and 14 show portions of two negative films which have been specially perforated. A

Fig.' 15 shows three films-two negatives with a positive ,between-registered together for printing.

F1 16 is a side view of the films in Fig. 15, s owing the double registry pins.

Fig. 17 is a diagram illustrating a printer which imafges are printed on one side of the positive a ter the corresponding images on the other negative have been printed on the other side. v 4

Fig. 18 is a side elevation, partly in section, of a camera in which the registry pins are stationary and the film-is moved into engagement with them.

`ig. 19 is a side view of the registry mechanism of Fig. 18, showing the films disen aged from the registry pins.

"ig. 20 is a rear view ofthe registry plate used in the ca'mera illustrated in Figs. 18 and 19, showing the ends of the registry pins in dotted lines.

Fig. 21 is arear view of a registry plate with two registry pins, one above the other.

Fig. 22 is a Arear view of a registry plate having a single registry pin. A'

Fig. 23 is a diagrammatic side view of an optical printer, for printing by optical projection of the images from the negative iilms'upon the positive film. y A

Fig. 24 shows a negative film with certain of the usual 'erforations omitted and special perforations. provided between the successive images.

Fig. 25 shows the same film after it has beenre-perforated to supply the omitted perforations.

Fig. 26 shows the same film as ositioned in the printer, with the specie registry pins employed.`

The'camera illustrated in Figs. 1 and 24 comprises a base 1, on which the sliding front 2 is adapted to Vb'e moved '(for focusing) between, ides 3, 3, by the rack and pinion 5, 6. he lens 4 is carried by the front 2. I

The light from the lens enters the splitting prism 7 9, composed of two triangular prisms having their inclined faces 8 cemented together. One of these surfaces is partially silvered, asl for example in bands or stripes 10, Fig. 3, so that incident rays striking the silvered portions will be i1-A flected at right angles and Vpass thence through the filter 11, preferab y green, to the green film, not shown, while rays striking theunsilvered portion of surface 8 are transmitted and pass through the filter 12, preferahl red, to lthe red film 13, Fig. 2. Prefhrably the prisms used are of the 45 type, but in any case the surfaces from which the rays emerge should be perpendicular to the axial rays and the films should be perpendicular to the same rays. The films used may both be panchromatic, or one may be specially sensitized for the green group of rays, as for example by pinaverdol, .and the other for the red group, as by pinacyanol. If the films are specially sensitized. I sometimes prefer to use in front of the green film 13, Fi 1, a yellow 4 filter, such as the standard Kg or K,x which will sufiiciently reducethe action of blue and violet rays onthe film. Such a filter is faster than any green filter thatl I know of and thus permits shorter exposures to be made. A

The splitting prisms are held firmly on their base 14, Figs. 2 and 2, by means of screws 15 in the upper spring clips 16. The base is mounted on a' vertical pivot 17 'the axis of which is in the plane of the reflecting and transmitting surface 8. The prisms can therefore be rotatively adjusted to shift the refiected image laterally onV the film.l To

make this adjustment easil and accurately the base 14 is provided on one side with a lug gFig. 1) vhaving a capstan screw 19 90 gvirkling between two stops 20 on thc camera e By the optical system described above, two separate light-images of the object to be photographed are produced in predetermined areas or parts of two separate focal planes, preferably at right angles to each other.A

The two films/are fed intermittently Athrough their film gates (which embrace the above-mentioned focal plane areas) by any suitable mechanism, as for example a Lumiere or a Geneva movement, one Vof the latter type being' illustrated in connection with the film13 which is advanced by the 105 sprocket 21. lTe shaft 22, which is the main driving shaft, rotated manually by means of any convenient mechanism, is connected by bevel gears 23 to shaft 24 which actuates the feeding mechanism (not shown) fo'r the other film.

The cams 25, 26, are mounted on shafts 22, 24, respectively, and are arranged to actuate the rocker arms or levers 27, 28, at the proper times. The registry pins 29,` 29, 30, 30, are mounted in guides 31, 31, 32, 3 2, carried by the registry plates 33, 34, to reciprocate in paths perpendicular to the films. Coil springs 35,36, urge the pins outwardly against their actuating arms 27, 28, and press the latter firmly a ainst the cams.

The cams 25, 26 are pre erably so timed that as soonyas the films have been fed down one image space the registry pins are advanced into their res ective perforations. 126 In general it isdesira le that the pins enter perforations which are as near as possible tol the centers of the respective exposure spaces or areas on the films, and I therefore prefer to have the pins in the lines 130 passing horizontally through the vpoints where the 4axial'rays strike'the films; the -feedin mechanism being constructedl so "that W en the flms'come to resta pair of perforations on each film will be opposite the respective registry pins, `The feedmechanism should also maintain the? usual loop'or slack` in *the films above the film gates', ermit 4the films' the film vgates to` be sbided slightly' downwardly 'or 'sidevvse' rby the re stry "pins, 'and the" lower sprockets shoul beset to: leave the centers of the re istry perforatiohs (which are entered b t e registry pins) slightly above the -axiso Vthe-pills so that 'the "latter will not be requiredto lraise the"lm',lwh1ch,\as Will be readily understood,`is held `dovvnby the sprocket a'lid hence cannot move upwardly.

In the4 clawl'type'of feeding mechanlsm the claws ,leave the 'film at: the end of their downward "stroke and the' film' is therefore free.' 'prefer they Geneva-type, however, for tlie'lreasonth'at thefee'din Ymovement requiresonly about`one-sixtli o fthe' revolution ofl the driving shaft 'as a' ainstathird, more orless, in the Lumierelc aw type; thus affording;ample` time' for the -peraton of the re pins Without reducing the periodv evoted tol exposurefof the films.

One Ajof the registry pins is illustrated 1n detail'in Figs.' 5 and 6. there shown, eachpin comprises around shank fitting .its guide" (designated b 31 in Figli 5), which has an interior gui e groove 37' to receive thei stud 38- carried "by Vthe shank. As shown in Fig. :5, ythe front portion of the in is shaped to fit the erforations in the vElm, and to facilitate lts entry Vinto the perforations its point is beveled, preferably with a longer bevel on the underside to give adequate camming eflfectdownward when the film comes to rest (after the operation of the feed mechanism) with the center of the perforation above the axis, of the The pin should advance with its flat surfaces 39, 40, Figs. 5- and: 6,"truly parallel to the flats of the film perforation, in order to avoid ossible distortion or other injury to the .e ges of the perforation; or the pin should be capable of slight rotary movement' so as to adjust itself to the perforation. For this reason I prefer to have. the pin shank round and ma {ethe stud 38 slightly smaller than its keyway 37. The pin is thus maintained in such 'position that the flat of its taper will'engage the flat of theperforation and, if thepln and perforation are not exactly registered, will cam the pin rotatively until the flats make even contact throughout. The pinitself is then rotated to its normal posltion (that is, to the position which it occupies during the exposure period) by the closely fitting pinably the regist vtionto fthe re spending f= registry perforations J'is I taken as I afstandardf and the corresponding relation on the other film is adjusted to conform thereto. My'inventi'o'n contemplates-several ways 'of eifectingthis adjustment,| for example Aby van optical method, to speak, in which 'the image is 'shifted -horizontally or vertically, 'or in both directions, `or by a mechanical method, in which the registry pins which eoperate with one ofthe films are shifted, or by a combination of both methods; f

f In the optical method of adjustment illus trated` herein the reflected image'is shifted laterali in either direction to any'desired extent y Vturning the light-splitting device on its vertical axis by 'means of the screw 19, 'as alreadydescribed. To raise or lower the reflected image one side or the other of the light-,splitting device is raised by placing shown. Or'screws, -as 42, Fig. 2,`can be provided in the base 14 at each lside to raise or lower one side or the other as may be desired. In the mechanical method I prefer to efl'ect the vertical registry pins to` raise or lower 4the registry perforations or shift them laterally relatively to the image in the focal plane by the use of shims 43, 44, and screws 45,

er than Athe perforations. Y

the

under "it one or more shims, not T3 adjustment of the 46, Figs. 2, 4 and 5. In practice my proof an inch, and then substitute for the shims used others of proper thickness to correct the errors. Quick and accurate results are obtained by this method.

The apertureplates 47, Figs. 1, 2 and 5, behind which the films travel, are secured directly to the guide plates 33 34 (so as to be shifted with the latter when they are adjusted), by means of a dowel 48 and screws 49, Fig. 4, and are provided at each side with pin-apertures 50, Fig. 5, to receive the registry pins. The apertures preferably fit the pins closely.

The pressure plates 51, Figs. 1, 2 and 5, hold the fil-ms snugly against the rear surfaces of the aperture plates 47 while the exposures are bein made, the .registry pins extending throng the relatively large openings 52. As .the pins advance, the shoulders on the pins meet the springs 53 and by their pressure on the latter press the plates 5l upon the back of the films. At Vone end, say the top, springs may be fixed to the pressure plates but at the other .end are preferably iheld loosely by the screws, see 54 Fig. 2, to ,permit free flexure of the springs without cramping the pins.

The shutter 55, Fig. 1, operating in front of the lens to expose and obscure the films, is actuated from shaft 24 by means of the gears 56, 57, in harmony with the movement of the films.

From the foregoing the .o` ration of the camera will be readily un erstood. The parts being in the ,position shown in Figs. 1 and 2, the shutter uncovers the lens to make the exposures and then .covers it again. The cams 25, 26, rotating in the direction of ythe arrows and operating through the Vlevers 27, 28, now permit the springs 35, 3G to retract the .registry pins 29, 30, thereby releasing the film, after which the lower feed .sprockets draw the film down through the space ofone picture. The cams then advance registry pins again, which justify the films and throu h the medium of the pressure plates 5.1 ho d them firmly in position, thus bringing the parts again to the positions shown in Figs. 1 and 2, and completng the cycle.

As previously stated, I prefer to arrange the registry ins at the horizontal or transverse centerine of the image space, as in Figs. 2 and 4, but they may be positioned to enter other pairs as for example the next pair `above, as in 10, or the next below, as in Fig. 11. I also refer to use corresponding pairs of periorations in the two films, but modern perforating machines are so accurate in operation'that the error between their successive perforation is, I have found in practice, entirely negligible, and it is therefore practicable to use different perforations in the two films. For example, I may arrange the registy pins as in Fig. 10 for one film, and as in *ig 11 for the other. Or I may have one pin below the transverse center-line and one above, as in Fig. 12, or two perforntions on the seme side of the film muy be used, with two pins, one above the other, as 29, FiA 21. Indeed I may use only one pin as in 4 1g. 22, but in thise case it is well to provide a vertical guide 52 on one side of the film above and below the guide plates, against which guides the film is lightly pressed, to prevent side play' or weave In fact, with film perforated accurately an icrforations may be used, but they shouldI he near the picture space so lo avoid or minimize the effects of shrink- ;age in development. Still another method is illustrated in Fig. .25. In the film there shown every fifth perforation on each side is omitted but perforntions 58 between the spaces for the pictures are provided for the registry Vpin or pins, which are of course correspondingly arranged in the camera. These intermediate perforntions may be of the standard shape and size, or the may be round as shown. In using such a lm in a ycamera employing sprockets to advance the film every fifth tooth on each side of the sprockets is omitted. After developing, fix ing .and drying, the film is re-perforated to supply the missing perforetions, as at 58a, in :F ig. 25, using the intermediate perform tions 58 as guides for the pilot pins in the perforator, .and preferably using these new perfor-ations, 58, for registry in printing.

inasmuch as developed and fixed film is found, after drying, to have shrunk about one per cent. of its original length I prefer to have the perforations in the undeveloped negative one per cent. farther apart (vertically) than in the unpriuted positive, so that in printing the latter (after the negative film has shrunk) the perforations in the two negatives and the positive will match exactly.

If the film has been supersensitized for one or more colors by means of a dye both nffcr perforating, I prefer to use in the camera registi' f pins of the type illustrated in Fig. 26. I ere the pin 59 on one side of the film is shaped to fill the perforation," verticnlly and horizontally; while on the other side the pin 59 fills the perforation vertically but not horizontally, to prevent any slight bending of the film in its own plane.

In the cameray illustrated in Figs. 18 to 21 inclusive, the registry pins, as 29a, are not reciprocated but are stationary and the films are slipped on and off' the pins, the entire film for a suitable distance above and below the pins being swung clear of the pins Vbefore it is fed down for the'next exposure. For this purpose the films, as 13, 13, fed down step-by-step by the feed sprockets, pass through swinging film gates 60, pivoted at the top. The cam 61, fixed on the shaft (32 (corresponding to shaft 22 in Figs. 1 and 2), works in and reciprocntes a frame 63 which is connected to bottom of the film gate by e link 64. It will be understood that similar feedin mechanism, with a simi ler cam, frame en link, is provided in conjunction with the other film gate. The parts being in the position shown in Fig. 18, the shutter (not shown) makes the exposure. The cams then advance the frames, which Swin the lfilm gates forwardly, carrying the lms off the'registry pins. The feed sprockets now draw the films down one picture space and come to rest, after which the cams retract the film gates and bring the next registry perforations in the films into engagement with the pins, thus completing the cycle and leaving the films accurately positioned for the next exposure. As in the other cameras illustrated, the light splitting device is adjustable to correct the relative positions lof the images in the focal planes by the optical method described, and the registry or ide plates 'as 33", are adjustable vertica y and horizontally (preferably. by thev use of shims, not shown) to makev the correction by thel mechanical method.'

fFor printingthe 1 ositive lilms I prefer to use the printer i ustrated in Figs. 7, 8 and 9. The red color record negative 65, thegreen color record negative 66, rand the positive67 between the two, are fedtogether step-by-step, one picture space at av time, through the film gate and past the exposure openingfoneach side,by the feed'pins 68,

Vwhich vare fixed in a crosshead 69 mounted to be reciprocated lengthwise of the films jon rails 70 by a sliding and oscillatin link171 connected to the crank disk 72. he feed pins 4are withdrawn from the films by springs 73,' Fig.'9 and are passed into the film perforations by solenoids C, the ylields of which act upon the iron outer portions of the pins, theinner portions of the pins being made of brass or other non-magnetic metal. After the films have been fed forward and the feed 'pins withdrawn (throu h the def'nergization -of the solenoids) t e registrypins 74, which have been held in their outer positions bythe s rings 75, are advanced by the solenoi s D, the elds of which attract the iron cores, into registry perforations in the films. The perforations used in negatives for registering the two are preferablyfthe same perforations as were used in the camera, but if the films were perforated With. sufficient accuracy other erforations may be used in the rinter. he apertured pressure plate, part o which is shown at 76, Fig. 8, 1s next drawn in by the solenoids E, thereby pressing the three films snugly together u on the plate 77. The exposure is now ma e, after which the operations described are repeated until .the printing is complete. The solenoids C, D, E are energized and denergized lunder the control of the timing commutator, Fig. 8^, by means of the respective contacts or segments c, d, e. The timing is determined by the length of the contacts, and is represented ir thidia l agli, Fig. 8B, by the respective anes g In Fi 12? is illustrated diagrammatically a metho of printing in which the two negative images are no# printed on the positive simultaneously but instead one image of the pair is printed, on one side of the positive, and later the other image of the .pair is printed on the other side in registry with the `first. In this figure 78 represents the positive film. 79 is one negat1ve film, say the red color record, registered with the positive by registry pins, of which one is shown at 8(4). 81 is the other ne ative, regis tered by pins 82 to print the other image of a pair that was previously printed at the position indicated by the pin 80. Preferably, in each case the pins 82 coperate'with the same perforations (in the positive) .that

were entered by pins 80. r

Figs. 13 and 14 illustrate a pair of negative lms made simultaneously in a camera in vwhich the registry pins were not located in the same relative positions and hence did not enter correspondmg perforations in the two films. In the films 83 and 84 shown, the registr or master perforations 85` were enteren by registry pins located as in Fig. 11,` while registry or master erforations 86 were entered by pins locate as in Fig. 10. Films so registered in the camera are preferably 'printed on lthe positive 87 by means of double registry pins 88, 15 and 16. To prevent the ed es of the registry perforations on each fi from` inter,- fering with the pin that registers the other iilm, in printing, the adjacent perforations, 89 in film 83, and 90 in film 84, are enlarged. as shown, so that the pins 88, Fig. 15, can pass into the proper registry perforations.

The films may also be printed by optical projection, as for example by means of the apparatus illustrated diagramatically in Fig. 23. In the apparatus shown, the positive Hlm 91 (one of the color record ne atives made according to my invention) is ed upwardly step-by-step ,through the film gate 92 and the negative {ilm` 93 is fed down- Wardly step-by-step through the film gate 94. t each step the two films are registered by re istry pins 95, 96, actuated by mechanism Ike that illustrated in the camera, Figs. 1 and 2. A suitable projecting lens 97 projects the rays from the negative 93 through the light-tight housing 98 to form the image on the positive film 91`. A suitable shutter, not shown, is 'provided to cut oli' the light while the films are in motion and are being re istered. The feed mechanisms may be li e that shown in Fig. 2. After the series of images is printed on one side, the positive is turned over and run through again, with the other color record negative to receive the other images of each pair or group.

It is within the spirit of my invention to use two lenses, one for each film, instead of a single lens as in Figs. l and 18. Also the two exposures (to make an image pair in their own planes or group) may be made one after the other instead of simultaneously. In place of exosing two negative films, a single film of Souble width may be used and the images made side by side. After exposure the negative can be split len Wise to form two separated color recor if desired, or its images can be printed on the two sidesof the positive without splitting the negative in two. For three-color cinematography three separate negative lms may be used.

It is to be un erstood that the invention is not limited to the specific details herein illustrated and described but can be practised in other ways and embodied in other forms Without departure. from its spirit as defined by the following claims:

I claim:

1. In a camera f'or making negative films for color cinematography, 1n combination, optical means for producing separate images in separate focal plane areas; intermittently operating film-feeding mechanism for passing a pair of perforated negative films step *by step through the respective focal plane areas and permitting the films to be shifted in their own planes afterv the feed mechanism comes to rest; film-shifting devices adapted to cooperate with at least one selected perforation in each film at each step and Operating independently of the feed mechamsm after each feeding operation thereof, to shift the films in the respective focal planes to positions in which the selected perforations are in predetermined' relation to the positions of the light-ima s projected by the said o tical means; an means for actuatin the eed mechanism and the film-shifting evices in harmonywith each other.

2. In a camera for making negative films for color cinematography, in combination, optical means for producing separate ima es in focal planes at an ange to each ot er; a pair of film gates having exposure apertures; mechanism for feeding two, films step. by step through the respective film gates and permitting thefilms to be shifted after the feed mechanisms come to rest; adjusting means coperating with said optical means to shift at least one of the images in its focal plane; film-shifting means coperating with at least one selected perforation in each film in the respective focal plane independently of' the feed mechanism at each step t'o shift the films to positions in which each selected perforation has. a predetermined positional relation to the respective ima geprojected by the optical means; and mechanism for actuating the film-shifting means after each operation of the feed mechanism.

3*. In a camera for making negative films for color cinematography, in combination, a pair of film gates arranged at an angle to each other and having exposure-aperture plates; optical means for projecting optihal images through the ex osure apertures in said plates; mechanism or feeding two perforated films step by step through the respective film gates; registry pins adjacent to the aperture plates to co erate with selected perforations in the lms and thereby shift the films horizontally and vertically in their respective focal lanes at each step independently of the eed mechanism; and means for shifting the registry pins and aperture-plates in planes parallel with the film gates to vary the exposure-location of the fihns relative to the respective imagesprojected hyI said optical means.

4. In a color cinematographic camerav adapted to make two negative color-records simultaneously on two separate fihns, the combination of two film gates arranged at an angle to each other and each having an exposure aperture, means for feeding the two films intennittent'ly through the film gates step by step and permitting the films to be shifted' in theiry own planes after each step. optical means to project similaroptical images through the two said apertures and record on the two films images of the sanne object by action of light of different colors, tapered registry pins adapted to enter at least one selected' perforation in each of the' said films near the respective exposure aperture and shift the selected perforation in each film at every step'to a constant position, and means for shifting one of the optical images relatively to the respective registry' pin so that the separate photographic images produced on the two films will be exactly similarly positioned in relation to the respective selected perforations.

5. In a color cinematographic camera. inl combination, a pair of film gates arranged at an angle to each other and having exposure aperturesmeans forfeeding a pair of perrforated negative films through the film gates step by step past the exposure apertures; a pair of reciprocatory registry pins adjacent one of the film gates to coperate with a selected pair of perforations in the film to shift the latter in its own plane independently ofthe feedingy means; a pair of registry pins adjacent to the other filmgate to coperate with a selected pair of perforations in the filmto shift the Iatterin its own planey independently of the feeding means; means for shifting one pair of pins in a: plane parallel with the exposure aperture in the respective film gate to locate such pins in the same relative position as the other pins: optical mea-ns for projecting separate optical images of the same object through the exposure apertures andin constant position relative to each other; and mechanism for actuating the registry pins after each operation ofy the film-feeding mechanism.

6. In a colbrcinematographic camera, in

combination, a film gate having an exposure aperture; means for feeding through the film gate step by step past the exposure aperture a perforated negative film having non-circular perforations; a reciprocatory registry pin, adapted to fit closely each perforation of a series of non-circular perforations in the film, and capable of sli ht rotary movement to accommodate itsel to the position of the film; means coperating with the pin after it has entered the perforation to rotate the pin to a constant position and thereby shift the film to a correspondingly constant position; and means for actuating the registry pin after each operation of the feeding mechanism.

7. In a color cinematographic camera for making negative images on perforated negative films, having non-circular perforations, in combination, stepbystep film-feeding mechanism; reciprocatory registry pins adapted to fit the non-circular perforations and capable of limited rotary movement whereby to accommodate themselves to the positions of the perforations; means having apertures in the path of the pins to receive the pins after they have entered the perforations and rotate the pins each to a predetermined constant position; and means for actuatin the pins after each operation of the feeding mechanism.

8. In a color cinematographic camera, in combination, a film gate having an exposure aperture and ad'acent thereto a pin-aperture of non-circu ar cross-section; a tapered registry pin capable of limited rotation; arranged to move into and out of the pinaperture and be rotated thereby to a constant osition; means for feeding step by step tlifrough the film gate a negative film, having non-circular perforations adapted to receive the registry pin whereby the rotation of the registry pin by the pin-aperture will shift the film in its own plane; and mechanism for actuating the registry pin after each o eration of the feeding means.

9. In a co or cinematographic camera, in combination, an exposure-aperture plate; a pressure plate in rear of the aperture plate and spaced therefrom to permit the film to pass between the two plates; a pair of reciprocatory registry pins of non-circular shape movable through non-circular rforations in the film and into and out of t e pin-apertures; and means enabling the ins to press the pressure plate upon the fi after the pins have entered the erforations and thereby hold the film in a xed position during ex osure.

10. n a color cinematographic camera, in combination, a film gate having an exposure aperture, means for feeding a perforated film step by step through the film gate past the ex osure aperture, means operating after each feeding movement of the film to shift reciprocatory registry the latter to a predetermined constant position relative to the exposure aperture; and a device actuated by said means at each o eration of the latter, to hold the film in said constant position during exposure.

l1. In a color cinematographic camera, in combination, a film gate having an exposure aperture and a non-circular pin-aperture adjacent thereto; means for feeding step by step through the film gate a negative film having non-circular perforations; a pair of ins of non-circular cross section movable t rough perforations in the film; a pressure vplate having spring members in the path of the shoulders on the registry pins for actuation by the latter to press the plate againstthe film and hold the latter in a fixed osition during exposure; and mechanism finir actuating the registry pins after each operation of the feeding means.

12. In a color cinematographic camera, in combination, a film gate having an exposure aperture and a pair of pin-apertures in its front, and uipped with a pair of rearwardly exten ing pin-guides; a pair of reciprocatory non-circular registry pins in said guides, adapted to coperate with noncircular perforations in a film fed through the film gate step by step and each having a shank capable of limited rotary movement in its respective guide; the pins and pinapertures cooperating to rotate the pins to a constant position after they have passed through the perforations in the film; and means for actuating the pins intermittently.

13. In a color cinematographic camera, in combination, a film gate having an exposureaperture plate and a pair of in-apertures in its front; a rear carrier-p ate having a pair of pin-guides alined with the said pin-apertures; registry pins mounted to reciprocate in the pin-guides and enter the pin apertures after passing through perforations in a film fed step by step through the film gate, to shift the film at each step to a constant position; and means for shifting the rear carrier plate, and the exposure-aperture plate simultaneously in their own planes to var v at will the aforesaid constant position of the film.

14. In a color cinematographic camera, in combination, a film gate having an exposure aperture in its front and an opening in its rear; a carrier plate in the rear opening and having a pair of pin guides; reciprocatory registry pins in the guides, to coperate with perforations in a film fed step by step through the film gate and shift the film at each step to a predetermined constant position; one or more shims between the carrior plate and the edge of the said rear opening; and screw means for pressing the carrier plate against the shims.

15. In a color cinematographic camera, in

combination., a film gate having an exposure aperture in lts front; a carrier plate having pin guides perpendicular to the plane of exposure aperture; mechanism for feeding a perforated film step by step through the film gate and permitting movement of the film in its own plane after the feed mechanism has come to rest; reeiprocatory registry pins in the pin guides to coperate with selected perforations in the film after each step and shift the film to a constant position; and

, means forshifting the said carrier plate in light-image of an ohjeet in a predetermined focal-plane area; mechanism for feeding a perforated film Step by step through said focal-plane area and leaving the film free to hc. shifted in the focal-plane after each step; a pair of reciprocatory registry pins adapted to cooperate with selected perforations in the film af'tcr each step independently of the feed mechanism to shift the filmin the focal plane to a constant position therein; and means plane parallel with the focal-plane to vary at will the location of said constant position with respect to the said focal-plane area.

1n testimony whereof I hereunto affix my signature PECY DOUGLAS BREWSTER.

for shifting the registry pins in a i 

